What is Die
In the PCB industry, a “die” refers to an unpackaged, bare chip that contains an integrated circuit. It is a small block of semiconducting material, typically made of electronic-grade silicon or other semiconductors like GaAs, on which a specific functional circuit is fabricated. The fabrication process involves techniques such as photolithography to create the necessary patterns and structures on the semiconductor material.
Integrated circuits are produced in large batches on a single wafer, and this wafer is then cut or diced into individual pieces, with each piece containing one copy of the circuit. These individual pieces are known as dies. Each die serves as the foundation for the functionality of the entire circuit.
To facilitate handling and integration onto a PCB, most dies are packaged in various forms. Packaging involves enclosing the die in a protective casing, which provides mechanical support, electrical connections, and protection from external factors such as moisture and physical damage. The packaging process ensures that the die can be easily integrated into the overall PCB assembly and provides the necessary connectivity for the circuit to function properly.